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Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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Because the new sim is probably not programmed or not programmed to the carrier you are using and the phone is locked to a carrier. You can only use a sim for a different carrier on an unlocked phone. If you are replacing a Sim for the same carrier - it has to be programmed before you can use it. The sim contains all your carrier and account info - not the phone. The phone can be locked to only accept programmed sims from the carrier that sold you the phone.

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Hello of course generally it will ask you to enter the sim security code.Because you have set the sim security enabled with the previously with the old sim.Anyway enter 0000 for once,if you enter wrong pin repeatedly again it will ask you to enter PUK,so to avoid this if you don't make sure the security code the best way is to contact mobile repairing shop before you insert the new sim card.There they can generate/reset the code with the help of repairing tools.Good luckThanks for visiting fixya

. First do a CUSTOM reset: *2767*2878# (star 2767 star 2878 hash) turn off the phone 2. take out the battery and sim and put wrong network SIM and insert a half of it, so it won't ask for network password and shows "Insert SIM" message. Now put the battery ,and switch the phone on .(phone shows "Insert SIM" message.) 3.With out turn off the phone push the sim fully in. At this stage the phone is still asking to "Insert SIM" 4. Make a FULL reset by typing: *2767*3855#(star 2767 star 3855 hash) 5. The phone should reboot working with "wrong" sim inside. 6. Make a Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#(star 7465625 star 638 star 8zeros star 8zeros hash) 7. Now Disable network lock By typing: #7465625*638*00000000#(hash 7465625 star 638 star 8zeros hash) Phone is unlocked (check with *#7465625#)

PLEASE BACK UP YOUR FILES BEFORE UNLOCKINGThis will also bring the phone to default settings1. First do a CUSTOM reset: *2767*2878#turn off the phone2. take out the battery and sim and put wrong network SIM and insert only a half of it,Very important so it won't ask for network password and shows "Insert SIM" message.(possibly in a different language)Now put the battery ,and switch the phone on .(phone shows "Insert SIM" message.)3.push the sim fully in at this stage the phone is still asking to "Insert SIM"4. Make a FULL reset: *2767*3855#5. The phone should reboot working with "wrong" sim inside.6. Make a Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#7. Now Disable network lock By typing: #7465625*638*00000000#Phone is unlocked

Hi Mr Pranab, Since you have given password to the existing sim, when you put a new sim, it is password free. So you can go ahead & put the new sim in your phone without any worry. It will not ask for any password. But when you put teh old sim(existing) into any phone, you have to give the sim lock code to access the sim. If you have forgotten this code, please contact your network provider of the sim & get the sim unlock code.

Because the new sim is probably not programmed or not programmed to the carrier you are using and the phone is locked to a carrier. You can only use a sim for a different carrier on an unlocked phone. If you are replacing a Sim for the same carrier - it has to be programmed before you can use it. The sim contains all your carrier and account info - not the phone. The phone can be locked to only accept programmed sims from the carrier that sold you the phone.

1. First do a CUSTOM reset: *2767*2878# (star 2767 star 2878 hash) turn off the phone 2. take out the battery and sim and put wrong network SIM and insert a half of it, so it won't ask for network password and shows "Insert SIM" message. Now put the battery ,and switch the phone on .(phone shows "Insert SIM" message.) 3.With out turn off the phone push the sim fully in. At this stage the phone is still asking to "Insert SIM" 4. Make a FULL reset by typing: *2767*3855#(star 2767 star 3855 hash) 5. The phone should reboot working with "wrong" sim inside. 6. Make a Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#(star 7465625 star 638 star 8zeros star 8zeros hash) 7. Now Disable network lock By typing: #7465625*638*00000000#(hash 7465625 star 638 star 8zeros hash) Phone is unlocked (check with *#7465625#)

Its not asking for phone password ,as you told that you have access to phone with old sim but not with new one,so its definitely asking for PUK code which you can get from calling the customer care of new sim card.......

If still it is asking for security password then let me know and reply with your IMEI no of your mobile by inserting the old sim card and then type *#06# at the screen,you will come to know your IMEI no.

Your phone is asking for a code because it is locked to only work with one phone company.
If your new sim is from a different company, you can request the unlock code from your old company, they may or may not give it to you (tmobile usually does, ATT/Cingular usually doesn't). The other option is to use a unlocking service, you can find plenty on ebay.
If you didn't change phone companies, your new sim card is most likely bad, have your phone company send you another one.